package com.ming.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.ming.reggie.common.BaseContext;
import com.ming.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER =new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

//        1、获取本次请求的URI
        String requestURI = request.getRequestURI();

//        2、判断本次请求是否需要处理.
        String[] urls = {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"

        };
        boolean check = check(urls, requestURI);

//        3、如果不需要处理，则直接放行
        if (check){
            filterChain.doFilter(request,response);
            return;
        }

//        4-1、判断后台登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee")!=null){
            Long empId= (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

//        4-2、判断前端登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user")!=null){
            Long userId= (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

//        5、如果未登录则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    }

    public boolean check(String[] urls,String requestURI){
        for (String url:urls){
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}















